unknown function : bpf_setsockopt
Engage-r opened this issue · comments
Shubhang commented
Hey I am new to bcc and am trying to change tcp congestion control algorithm using bcc.
I wrote this simple python script:
from bcc import BPF
bpf_source = """
#include <linux/bpf.h>
#include <linux/version.h>
#include <bcc/proto.h>
#include <bcc/helpers.h>
#include <linux/tcp.h>
#define TCP_CONGESTION 13
int bpf_set_congestion_control(struct bpf_sock_ops *skops) {
if (skops == NULL)
return 0;
char cong_alg[] = "reno";
bpf_setsockopt(skops, SOL_TCP, TCP_CONGESTION, cong_alg, sizeof(cong_alg));
return 0;
}
"""
bpf = BPF(text=bpf_source)
bpf.attach_kprobe(event="tcp_v4_connect", fn_name="bpf_set_congestion_control")
but when running it throws error:
bpf: Failed to load program: Invalid argument
10: (85) call bpf_setsockopt#49
unknown func bpf_setsockopt#49
Would be highly obliged if someone could help